Speccy is an advanced System Information tool for your PC. Speccy will give you all the information you need. Including CPU, Motherboard, RAM, Graphics Cards, Hard Disks, Optical Drives, Audio support.
You can probably name the processor (Intel or AMD, Celeron or Pentium), maybe how much RAM it has, and maybe how big the hard drive is.
When you go to a computer store and see all the bright shiny PCs laid out next to each other, most will have tags or stickers indicating the: